PT Swadaya Graha is a company in the construction
field. Welding T-joint connections are widely used in the construction field. Welding standard used is standard AWS American Welding Society Inc. where preheating must be slowed of cooling and prevent cracking defects. The process of welding the connection T-joint in this research use a low steel material type ASTM 387 Grade 22 with the length of the flange width of the flange and web height is 300 x 150 x 150 mm thick of flange and web is 254
mm. Each thing is preheated with the different temperatures range like without preheat 230F 300F and 370F. The survey results revealed that the work piece without preheating cracking defects while preheating the workpiece with disabilities there are no cracks. On Testing of angular distortion is also affected by preheating the highest value of angular distortion in the workpiece by heating the highest and the distribution of hardness will increasingly falls
with increasing preheating values. At the micro-analysis there is a change of grain size microstructure. Grain sizes formed in the HAZ region is corse ferlite and pearlite.the effect of earliest preheating influence on welding in cold crack distortion corse distribution and microstructure.

Keywords:

Pemanasan Awal; Las SMAW; Distorsi; Uji
Kekerasan; Struktur mikro

Subject

: Las

Contributor

Ir. HARI SUBIYANTO, MSc

Date Create

: 02/08/2010

Type

: Text

Format

: pdf.

Language

: Indonesian

Identifier

: ITS-NonDegree-3100010040335

Collection ID

: 3100010040335

Call Number

: RSM 671.52 Za`i s

SourceNon Degree, Mechanical Engineering, RSM 671.52 Za`i s, 2010

CoverageITS Community

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